CN104457796A - Sensing module - Google Patents
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- CN104457796A CN104457796A CN201310424631.1A CN201310424631A CN104457796A CN 104457796 A CN104457796 A CN 104457796A CN 201310424631 A CN201310424631 A CN 201310424631A CN 104457796 A CN104457796 A CN 104457796A
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Abstract
The invention discloses a sensing module. The sensing module comprises a sensing device, a voltage generation device, a compensation device and a voltage control device. The sensing device comprises a first reference end and a second reference end. The compensation device is coupled between the second reference end and one voltage reference end. The voltage control device is respectively coupled to the first reference end, the second reference end and the voltage generation device. The voltage control device is used for outputting first voltage signals to the first reference end according to reference voltage signals generated by the voltage generation device and pace voltage of the compensation device. The temperature change of the impedance of the compensation device is positively related to the temperature change of the impedance of the sensing device. The temperature change of the sensitivity of the sensing device is negatively related to the temperature change of the reference voltage signals. In such a way, the characteristic that the sensing device is drifting along with temperature is compensated.
Description
Technical field
The present invention relates to a kind of sensor, particularly a kind of sensor with temperature-compensation circuit.
Background technology
Along with the progress of science and technology, increasing sensor is had to be designed development out.Sensor of a great variety, has for pressure, temperature, gas, sound, brightness, speed, image ... etc. factor carry out the sensor that senses; And sensor is also used in the daily life of the mankind fully, example: as medical equipment, public transportation vehicle, safety detection, amusement, national defence ... etc.
Having now uses in the system of sensor, because environment temperature cause the problem of sensor accuracy, in order to promote accuracy, generally all can carry out temperature compensation measure for sensor, including of normal employing: (1) uses hardware circuit to carry out temperature compensation and (2) use hardware circuit and two classes such as software temperature compensation of arranging in pairs or groups.
But the temperature compensation mode of aforesaid two kinds of existing sensors all has shortcoming.First, the former circuit structure is complicated and need adjustment; Though and the circuit structure of the latter is simple, the correction of drift value need be carried out for each temperature spot, expends production hour.
For this reason, how to provide a kind of can for producing a kind of sensor temperature-compensation circuit and method that exporting change compensates because of variation of ambient temperature, to avoid the disappearance of the temperature compensation mode of above-mentioned existing sensor, become an industry difficult problem urgently to be resolved hurrily in fact.
Summary of the invention
In view of the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of sensing module, not only circuit structure is simple, and without the need to carrying out the correction of drift value for each temperature spot, effectively can promote the running performance of sensing module.
According to a kind of sensing module of the present invention, comprise sensing apparatus, device for generating voltage, compensation system and voltage-operated device.Wherein sensing apparatus comprises the first reference edge and the second reference edge, in order to according to the pressure received, produces sensing signal, wherein has equivalent impedance between this first reference edge and this second reference edge.Device for generating voltage is in order to produce reference voltage signal.Compensation system is coupled between the second reference edge and a Voltage Reference end.Voltage-operated device is coupled to the first reference edge, the second reference edge and device for generating voltage respectively, in order to the cross-pressure according to reference voltage signal and compensation system, exports the first voltage signal to the first reference edge.Wherein the sensitivity of sensing apparatus is the first function of a temperature, and equivalent impedance is the second function of a temperature, and the resistance value of compensation system is the 3rd function of a temperature, and the magnitude of voltage of reference voltage signal is the 4th function of a temperature.First function of temperature and the 4th function negative correlation of temperature, and the 3rd function positive correlation of the second function of temperature and temperature.
According to one embodiment of the invention, the second function of temperature is directly proportional to the 3rd function of temperature.
According to one embodiment of the invention, the first function of temperature is leader's coefficient is positive quadratic polynomial, and the 4th function leader coefficient of temperature is negative quadratic polynomial.
According to one embodiment of the invention, the first function of temperature is leader's coefficient is negative quadratic polynomial, and the 4th function of temperature leads coefficient to be positive quadratic polynomial.
According to one embodiment of the invention, device for generating voltage is energy gap band difference reference voltage circuit (bandgapreference circuit).
According to one embodiment of the invention, device for generating voltage comprises temperature sensing unit and voltage generating unit.Temperature sensing unit is in order to produce temperature signal according to environment temperature.Voltage generating unit is in order to produce reference voltage signal according to temperature signal.
According to one embodiment of the invention, compensation system is coupled to device for generating voltage, and compensation system comprises voltage source and digital analog converter.Voltage source is in order to provide temperature independent electric current.Digital analog converter is in order to produce the electric current with temperature correlation according to temperature signal.Wherein the output current of compensation system equals temperature independent electric current and adds the electric current with temperature correlation, and the resistance value of compensation system equals the ratio of the output voltage of compensation system and the output current of compensation system.
According to one embodiment of the invention, compensation system is a resistance.
According to a kind of sensing module of the present invention, comprise sensing apparatus, device for generating voltage, compensation system and voltage-operated device.Wherein sensing apparatus comprises the first reference edge and the second reference edge, in order to according to the pressure received, produces sensing signal, wherein has equivalent impedance between this first reference edge and this second reference edge.Device for generating voltage is in order to produce reference voltage signal.Compensation system is coupled between the second reference edge and a Voltage Reference end.Voltage-operated device is coupled to the first reference edge, the second reference edge and device for generating voltage respectively, in order to the cross-pressure according to reference voltage signal and compensation system, exports the first voltage signal to the first reference edge.Wherein the sensitivity of sensing apparatus is the first function of a temperature, and the magnitude of voltage of reference voltage signal is the second function of a temperature.First function of temperature and the second function negative correlation of temperature.
As mentioned above, provide according to sensing module of the present invention and have a sensing signal, this sensing signal is insensitive to temperature variations, and has high power supply voltage rejection ratio (power supply rejection ratio, PSRR).Therefore, reduce in sensing application according to sensing module of the present invention, the design complexities of back-end device.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1, it is the functional-block diagram of a kind of sensing module according to one embodiment of the invention;
Fig. 2 A, it is the circuit diagram of the sensing apparatus according to one embodiment of the invention;
Fig. 2 B, it is another circuit diagram of the sensing apparatus according to one embodiment of the invention;
Fig. 3, it is the schematic diagram of sensitivity relative to the relation of temperature of sensing apparatus;
Fig. 4 A, it is the circuit diagram of the device for generating voltage according to one embodiment of the invention;
Fig. 4 B, it is the function block diagram of the device for generating voltage according to one embodiment of the invention;
Fig. 5, it is the function block diagram of the compensation system according to one embodiment of the invention.
Wherein, Reference numeral
1 sensing module
11 sensing apparatus
13 device for generating voltage
15 compensation systems
17 voltage-operated devices
19 Voltage Reference ends
111 first reference edges
113 second reference edges
115a ~ c, 118a ~ b resistance
116a ~ d end points
117,119a ~ b strain gauge
133 temperature sensing units
135 voltage generating unit
151 current sources
153 digital analog converters
155 output terminals
M1 ~ M5 metal oxide field-effect transistor
Q1 ~ Q3 bipolarity junction transistor
R1 ~ R2 resistance
Embodiment
Below detailed features of the present invention and advantage is described in embodiments in detail, its content is enough to make any relevant art of haveing the knack of understand technology contents of the present invention and implement according to this, and content, right and the accompanying drawing disclosed by this instructions, any relevant art of haveing the knack of can understand the object and advantage that the present invention is correlated with easily.Following embodiment further describes viewpoint of the present invention, but non-to limit category of the present invention anyways.
Please refer to Fig. 1, it is the functional-block diagram of a kind of sensing module according to one embodiment of the invention.As shown in Figure 1, sensing module 1 comprises sensing apparatus 11, device for generating voltage 13, compensation system 15 and voltage-operated device 17.Sensing apparatus 11 comprises the first reference edge 111 and the second reference edge 113.Compensation system 15 is coupled between the second reference edge 113 and a Voltage Reference end 19.Voltage-operated device 17 is coupled to the first reference edge 111, this second reference edge 113 and this device for generating voltage 13 respectively.
Sensing apparatus 11 is in order to according to the pressure received, and produces sensing signal.In an embodiment, please refer to Fig. 2 A, it is the circuit diagram of the sensing apparatus according to one embodiment of the invention.As shown in Figure 2 A, sensing apparatus 11 comprises the first reference edge 111, second reference edge 113, first resistance 115a, the second resistance 115b, the 3rd resistance 115c and strain gauge (strain gauge) 117.First resistance 115a, the second resistance 115b and the 3rd resistance 115c are for the insensitive resistance of pressure.When sensing apparatus 11 does not receive pressure, the resistance value of resistance 115a to 115c and the resistance value of strain gauge 117 equal.When sensing apparatus 11 receives pressure, the resistance value of strain gauge 117 can change by received pressure.If have a voltage difference between the first reference edge 111 and the second reference edge 113, then, only when sensing apparatus 11 receives pressure, the magnitude of voltage at end points 116b will be different from the magnitude of voltage of end points 116a.
Voltage difference between end points 116a and end points 116b is exactly sensing signal.Suppose that the resistance value of each resistance in resistance 115a to 115c is R, and received pressure is Δ P, then the resistance value of strain gauge 117 equals (R+k Δ P).If now there is individual voltage difference Vin to be applied between the first reference edge 111 and the second reference edge 113, then the voltage difference Vo between end points 116a and 116b can represent with following equation.
Vo=kΔPVin/(4R+2kΔP)…………………(1)
As enough hour of received pressure Δ P, equation (1) can be approximated to following equation.
Vo=kΔPVin/4R……………………………(2)
Therefore voltage difference Vo is a linear function of received pressure Δ P haply.
In another embodiment, please refer to Fig. 2 B, it is another circuit diagram of the sensing apparatus according to one embodiment of the invention.As shown in Figure 2 B, sensing apparatus 11 comprises the first reference edge 111, second reference edge 113, first resistance 118a, the second resistance 118b, the first strain gauge 119a and the second strain gauge 119b.Wherein, the first resistance 118a and the second resistance 118b is to the insensitive resistance of pressure, and in other words its resistance value and suffered pressure have nothing to do.When sensing apparatus 11 does not receive pressure, the resistance value of the first resistance 118a, the second resistance 118b, the first strain gauge 119a and the second strain gauge 119b is equal.And when sensing apparatus 11 receives pressure, the resistance value of the first strain gauge 119a and the second strain gauge 119b change by the pressure being received.If now there is a voltage difference to be applied between the first reference edge 111 and the second reference edge 113, then end points 116c is different from the magnitude of voltage of end points 116d.
Voltage difference Vo between end points 116c and end points 116d is exactly sensing signal.The resistance supposing the first resistance 118 and the second resistance 118b is R, received pressure is Δ P, the resistance of the first strain gauge 119a and the second strain gauge 119b is (R+k Δ P), and voltage difference Vin is applied between the first reference edge 111 and the second reference edge 113.Voltage difference Vo between end points 116c and end points 116d can represent by following equation.
Vo=kΔPVin/(2R+kΔP)……………………(3)
As enough hour of received pressure Δ P, equation (3) can be approximated to following equation.
Vo=kΔPVin/2R……………………………(4)
Therefore voltage difference Vo is a linear function of received pressure Δ P haply.
Although only disclose the pressure-sensing device based on two kinds of favour department energising bridges above-mentioned, the category that it is not intended to limiting the invention, other devices with favour department energising bridge also can be implemented according to the present invention according to this.
Although sensing signal Vo and received pressure Δ P is roughly the relation of linear transformation, sensing apparatus 11 still perplex by other nonlinear problems, the variation of such as sensitivity and the variation of equiva lent impedance.
Please refer to Fig. 3, it is the schematic diagram of sensitivity relative to the relation of temperature of sensing apparatus.When a fixing voltage difference is applied between the first reference edge 111 and the second reference edge 113, it is fixing that the sensitivity of sensing apparatus 11 is expected.But in certain embodiments, as shown in Figure 3, along with temperature rises, the sensitivity of sensing apparatus 11 declines.Meanwhile, also can find that the sensitivity of sensing apparatus 11 is first functions of temperature.It is positive quadratic polynomial that first function of temperature can be regarded as leader's coefficient.In order to compensate the variation of the sensitivity of sensing apparatus 11, the first function of a magnitude of voltage and temperature is needed to be the voltage of negative correlation, therefore as device for generating voltage 13 described later is applied in one embodiment of the invention.
In addition, the variation of the equiva lent impedance of sensing apparatus 11 is the variations of the resistance value coming from resistance in sensing apparatus 11 and strain gauge.The resistance of the equiva lent impedance of sensing apparatus 11 is defined as the impedance between the first reference edge 111 and the second reference edge 113, and this equiva lent impedance is the second function of temperature, can with described by following equation.
Rsensing(T)=R0[1+α(T-T0)]…………………(5)
In equation (5), the temperature-coefficient of electrical resistance (temperature coefficient of resistance, TCR) that T is temperature, α is the equiva lent impedance of sensing apparatus 11, T0 are reference temperatures, R0 is sensing apparatus 11 at the equivalent impedance of reference temperature T0 and Rsensing be sensing apparatus 11 at temperature T time equiva lent impedance.
Go back to Fig. 2 B, because the temperature-coefficient of electrical resistance of the temperature-coefficient of electrical resistance of each strain gauge and each resistance, so another error being called as zero migration (zero offset) can be produced.So-called zero migration is when sensing apparatus 11 does not receive any pressure, the skew of the output voltage of sensing apparatus 11.In order to compensate zero migration, and guarantee that the voltage difference Vin putting on sensing apparatus 11 can be controlled, because being employed herein compensation system 15.
Device for generating voltage
Device for generating voltage 13 is in order to produce reference voltage signal.Specifically, device for generating voltage 13 is used to the variation of the sensitivity compensating sensing apparatus 11.
In an embodiment, please refer to Fig. 4 A, it is the circuit diagram of the device for generating voltage according to one embodiment of the invention.As shown in Figure 4 A, device for generating voltage 13 comprises the first metal oxide field-effect transistor (metal oxide semiconductor field effect transistor, MOSFET) M1, second metal oxide field-effect transistor M2, 3rd metal oxide field-effect transistor M3, 4th metal oxide field-effect transistor M4, 5th metal oxide field effect transistor M5, first bipolarity junction transistor (bipolarjunction transistor, BJT) Q1, second bipolarity junction transistor Q2, 3rd bipolarity junction transistor Q3, first resistance R1 and the second resistance R2.Affiliated field has knows that the knowledgeable knows that the device for generating voltage 13 shown in Fig. 4 A is energy gap bands difference reference voltage circuit (bandgap referencecircuit) usually.Generally speaking, energy gap band difference reference voltage circuit is normally used to provide the voltage do not made a variation with temperature.But in the device for generating voltage 13 in one embodiment of the invention, the suitable selection resistance of palpus and/or transistor, become with temperature to make the reference voltage signal Vref of output.In fact, the reference voltage signal Vref in one embodiment of the invention roughly with PTAT, in addition, the magnitude of voltage of reference voltage signal Vref is the 4th function of temperature.It is negative quadratic polynomial that 4th function is roughly leader's coefficient.And the 4th function and the first function specific temperature range (such as Celsius 20 degree to 60 degree Celsius, Celsius-15 spend to Celsius 20 degree or Celsius-15 spend extremely 60 degree Celsius) present negative correlation or be inversely proportional to.
In another embodiment, please refer to Fig. 4 B, it is the function block diagram of the device for generating voltage according to one embodiment of the invention.As shown in Figure 4 B, device for generating voltage 13 comprises a temperature sensing unit 133 and a voltage generating unit 135, and voltage generating unit 135 is coupled to temperature sensing unit 133.
Temperature sensing unit 133 is in order to produce a temperature signal according to environment temperature.In a kind of implementation, can with electroheat pair as temperature sensing unit, the resistance value of electroheat pair can along with temperature change.For example, temperature sensing unit 133 can be electroheat pair, the thermal sensor based on oscillator, the thermal sensor based on analog-digital converter or other can be used to the device of measuring temperature.
Voltage generating unit 135 is in order to produce reference voltage signal Vref according to temperature signal.On the implementation, if because the magnitude of voltage of reference voltage signal Vref should a quadratic function relative to temperature, voltage generating unit 135 can comprise a processor and carry out temperature signal and a built-in quadratic polynomial carrys out the due magnitude of voltage of computing reference voltage signal Vref, and produces the voltage signal signal Vref as the reference voltage with this magnitude of voltage.
In the embodiment of aforesaid voltage generation device 13, reference voltage signal Vref and voltage source are independent mutually.Therefore reference voltage signal Vref come from hardly the noise of voltage source affect, thus there is high-voltage power supply rejection ratio (power supply rejection ratio, PSRR).
Although only disclose the enforcement aspect of two kinds of device for generating voltage 13 herein, the category that it is not intended to limiting the invention.Any can generation with temperature relation is in fact one leads coefficient to be the reference voltage signal of negative quadratic function with PTAT haply, and the circuit that simultaneously reference voltage signal can be made to have high-voltage power supply rejection ratio all can be applicable in the present invention.
Compensation system
Compensation system 15 in order to compensate sensing apparatus 11 with temperature variation property.Specifically, compensation system 15 is in order to compensate the variation of the equiva lent impedance of sensing apparatus 11.In one embodiment, compensation system 15 can be a compensating resistance, and this compensating resistance has specific temperature-coefficient of electrical resistance.Specifically, the temperature-coefficient of electrical resistance of aforementioned backoff resistance is close or equal in the temperature-coefficient of electrical resistance of the equiva lent impedance of sensing apparatus 11, therefore the resistance value of compensation system 15 is the 3rd functions of temperature, second function of itself and temperature, the namely resistance value of the equiva lent impedance of sensing apparatus 11, at least present positively related relation in specific temperature range (such as 20 degree to 60 degree Celsius Celsius ,-15 degree Celsius 20 degree or-15 degree Celsius extremely 60 degree Celsius extremely Celsius), or present the relation of direct ratio.
In another embodiment, the temperature-coefficient of electrical resistance of aforementioned backoff resistance at the edge in specified temp interval, time namely close to upper temperature limit or the temperature close to lowest temperature, slightly higher than the temperature-coefficient of electrical resistance of the equiva lent impedance of sensing apparatus 11.Particularly, the resistance value of compensating resistance is leader's coefficient relative to temperature is haply positive quadratic function.Therefore, the cross-pressure of sensing apparatus 11 is close to upper temperature limit or close to can lower than the cross-pressure at the real sensing apparatus 11 of room temperature during lowest temperature.By this, the difference of the resistance of the resistance of each resistance and each strain gauge is caused because of temperature thus the side-play amount of the zero migration produced can be suppressed.
In another embodiment, compensation system 15 can comprise a digital analog converter (digital-to-analog converter, DAC).Please refer to Fig. 5, it is the function block diagram of the compensation system according to one embodiment of the invention.As shown in Figure 5, compensation system 15 comprises a current source 151 and a digital analog converter 153.Current source 151 is in order to produce not temperature-dependent electric current I 1, and digital analog converter 153 receives temperature signal from device for generating voltage 13, and produces a temperature-dependent electric current I 2 according to temperature signal.Two electric currents, namely I1 and I2 is output to output terminal 155.Therefore, from output terminal 155 the summation of the output impedance that measures and two electric currents be inversely proportional to.
Specifically, in order to compensate the variation of the equiva lent impedance of sensing apparatus 11, the output impedance (namely equiva lent impedance) of compensation system 15 should be the 3rd function of temperature, and the 3rd function becomes positive correlation or the relation be directly proportional with the second function (namely the resistance value of the equiva lent impedance of sensing apparatus).
Although only disclose the enforcement aspect of two kinds of device for generating voltage 13 herein, the category that it is not intended to limiting the invention.Any device with the temperature-coefficient of electrical resistance of the resistance value of the equiva lent impedance of sensing apparatus 11 with the impedance of close temperature-coefficient of electrical resistance that can produce all can be applicable in the present invention.
Voltage-operated device
Voltage-operated device 17 is in order to export first voltage signal according to the cross-pressure (or output voltage) of reference voltage signal and compensation system 15 to the first reference edge 111.In an embodiment, voltage-operated device 17 can be an operational amplifier, and this operational amplifier has first input end, the second input end and output terminal.The output terminal of operational amplifier is connected to the first reference edge 111.First input end is connected to device for generating voltage 13 to receive reference voltage signal Vref.Second input end is connected to the second reference edge 113 to receive the cross-pressure of compensation system 15.Therefore, operational amplifier can export the first voltage signal, and makes the cross-pressure of compensation system 15 equal with the magnitude of voltage of reference voltage signal Vref.
In another embodiment, voltage-operated device 17 can comprise a processing unit and a digital analog converter (DAC).Processing unit receives cross-pressure and the reference voltage signal Vref of compensation system 15, and calculates the difference between the magnitude of voltage of the first voltage signal and required magnitude of voltage.Processing unit also control figure analog converter, to adjust the first voltage signal, and makes the magnitude of voltage that the magnitude of voltage of the first voltage signal equals required.
Although only disclose the enforcement aspect of two kinds of voltage-operated devices 17 herein, the category that it is not intended to limiting the invention.Any device that can produce the first voltage signal according to the cross-pressure of compensation system 15 and reference voltage signal all can be applicable in the present invention.
Because the temperature coefficient of the output impedance of compensation system 15 equals the temperature coefficient of the equiva lent impedance of sensing apparatus 11, the cross-pressure of compensation system 15 and the cross-pressure positive correlation of sensing apparatus 11, or more precisely, both meetings are directly proportional.By the first voltage signal of adjustment first reference edge 111 to make the cross-pressure of compensation system 15 identical with reference voltage signal, cross-pressure positive correlation (the being proportional in other words) reference voltage signal of sensing apparatus 11.Therefore, the sensitivity of sensing apparatus 11 and the variation of equiva lent impedance can be lowered.
As mentioned above, the sensing module according to the multiple embodiment of the present invention provides has a sensing signal, and this sensing signal is insensitive to temperature variations, and has high power supply voltage rejection ratio (power supply rejectionratio, PSRR).Therefore, reduce in sensing application according to sensing module of the present invention, the design complexities of back-end device.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (9)
1. a sensing module, is characterized in that, comprises:
One sensing apparatus, comprises one first reference edge and one second reference edge, in order to according to the pressure received, produces a sensing signal, wherein has an equivalent impedance between this first reference edge and this second reference edge;
One device for generating voltage, in order to produce a reference voltage signal;
One compensation system, is coupled between this second reference edge and a Voltage Reference end; And
One voltage-operated device, is coupled to this first reference edge, this second reference edge and this device for generating voltage respectively, in order to the cross-pressure according to this reference voltage signal and this compensation system, exports one first voltage signal to this first reference edge;
Wherein a sensitivity of this sensing apparatus is one first function of temperature, this equivalent impedance is one second function of temperature, one resistance value of this compensation system is one the 3rd function of temperature, the magnitude of voltage of this reference voltage signal is one the 4th function of temperature, this first function and the 4th function negative correlation, and this second function and the 3rd function positive correlation.
2. sensing module according to claim 1, is characterized in that, this second function is directly proportional to the 3rd function.
3. sensing module according to claim 1, is characterized in that, this first function is leader's coefficient is positive quadratic polynomial, and the 4th function is leader's coefficient is negative quadratic polynomial.
4. sensing module according to claim 1, is characterized in that, this first function is leader's coefficient is negative quadratic polynomial, and the 4th function is leader's coefficient is positive quadratic polynomial.
5. sensing module according to claim 1, is characterized in that, this device for generating voltage is an energy gap band difference reference voltage circuit.
6. sensing module according to claim 1, is characterized in that, this device for generating voltage comprises:
One temperature sensing unit, in order to produce a temperature signal according to environment temperature; And
One voltage generating unit, in order to produce this reference voltage signal according to this temperature signal.
7. sensing module according to claim 6, is characterized in that, this compensation system is coupled to this device for generating voltage, and this compensation system comprises:
One voltage source, in order to provide a temperature independent electric current; And
One digital analog converter, in order to according to this temperature signal, produces the electric current of one and temperature correlation;
Wherein an output current of this compensation system equals the electric current that this temperature independent electric current adds this and temperature correlation, and this resistance value of this compensation system equals a ratio of an output voltage of this compensation system and this output current of this compensation system.
8. sensing module according to claim 1, is characterized in that, this compensation system is a resistance, or the element of tool impedance operator, and has the temperature funtion characteristic of claim 2 or claim 3.
9. a sensing module, is characterized in that, comprises:
One sensing apparatus, comprises one first reference edge and one second reference edge, in order to according to the pressure received, produces a sensing signal, wherein has an equivalent impedance between this first reference edge and this second reference edge;
One device for generating voltage, in order to produce a reference voltage signal;
One compensation system, is coupled between this second reference edge and a Voltage Reference end; And
One voltage-operated device, is coupled to this first reference edge, this second reference edge and this device for generating voltage respectively, in order to the cross-pressure according to this reference voltage signal and this compensation system, exports one first voltage signal to this first reference edge;
Wherein a sensitivity of this sensing apparatus is one first function of temperature, and the magnitude of voltage of this reference voltage signal is one second function of temperature, this first function and this second function negative correlation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI577978B (en) * | 2015-07-22 | 2017-04-11 | 旺玖科技股份有限公司 | Impedance sensor and electronic apparatus using the same |
| CN109990804A (en) * | 2019-04-03 | 2019-07-09 | 安徽见行科技有限公司 | The self-correcting positive circuit of sensor circuit temperature drift based on analog multiplier |
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| TW201227753A (en) * | 2010-12-28 | 2012-07-01 | British Virgin Islands Central Digital Inc | Sensor temperature compensation circuit and method thereof |
| CN102624230A (en) * | 2011-01-31 | 2012-08-01 | 立锜科技股份有限公司 | Adaptive temperature compensation circuit and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI577978B (en) * | 2015-07-22 | 2017-04-11 | 旺玖科技股份有限公司 | Impedance sensor and electronic apparatus using the same |
| CN109990804A (en) * | 2019-04-03 | 2019-07-09 | 安徽见行科技有限公司 | The self-correcting positive circuit of sensor circuit temperature drift based on analog multiplier |
| CN109990804B (en) * | 2019-04-03 | 2021-06-29 | 安徽见行科技有限公司 | Self-correcting circuit of sensor circuit temperature drift based on analog multiplier |
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